nasa says the sun is in the process of reversing its polar magnetic field, and that means we have the best chance in a decade of seeing these spectacular northern lights. ben tracy went to alaska to meet a man who spent years capturing the phenomenon. >> reporter: dave parkhurst carries his camera into some of the most remote places in alaska. he waits for the sun to go down and the lights to come on. he's captured some of the most stunning images of the northern lights. >> well, the scientific term is aurora borealis, which is the goddess of light, fully spiritual because it's so powerful, it's beyond your imagination. >> reporter: when parkhurst moved to alaska in 1981, people told him about these light shows. they also said, don't bother trying to photograph it. when people said this isn't something you can capture on film, did it become a bit of a challenge for you to say, yeah, it is? >> it was the challenge, yeah.